Title page for ETD etd-01172009-063113
|Type of Document
||Hunt, William E.
||Breakup and coalescence in turbulent two-phase flows
||Master of Science
|Kornhauser, Alan A.
|Davis, Richey M.
|Date of Defense
Many engineering processes involve a gas and a liquid or two immiscible liquids in
turbulent flow. The turbulent flows present in two-phase systems will cause the bubbles
or drops of a dispersion to undergo breakup and coalescence, and the resulting changes in
the dispersion may significantly affect the engineering process under consideration. For
this reason, many researchers have studied breakup and coalescence in turbulent two phase
flows. Models that can be used to simulate changes in a dispersion over time have
been proposed, but these models contain constants that change with experimental
conditions and empirical equations that can only be considered valid for certain
experimental setups. The goal of this study was to develop general models that could be
used to predict changes in bubble or drop size distributions over time for turbulent flows
in agitated vessels and pipes.
Computer programs were written to reproduce the results of three agitated vessel
studies. These programs used existing population balance models to approximate the
changes in a dispersion over time measured in previous experiments. A new model for
breakup in agitated vessels was then developed and verified with existing experimental
data. A new model for coalescence in agitated vessels was also developed and verified
with existing experimental data. Both of these models are based on theory and are more
readily extendible than previous breakup and coalescence models. The work for agitated
vessels was then extended to turbulent two-phase pipe flow. Since there was only a
limited amount of experimental data available for breakup and coalescence in pipes, the
model for turbulent pipe flow could not be verified.
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